[BUG] 500 server error when using Yarn & PnP: Dynamic require of "/.next/server/middleware-manifest.json" is not supported

[amized]

Describe the bug

When using yarn pnp as my package management tool, I am able to build the application and run the preview command, however once the server is started and I make a request to / I get a 500 error:
Dynamic require of "/.next/server/middleware-manifest.json" is not supported

Steps to reproduce

Please see clean repo that reproduces the error: https://github.com/amized/opennext-cloudflare-pnp-issue

1. Checkout repo
2. Run yarn install
3. Run yarn preview
4. Visit site url in your browser or make a request to http://localhost:8787. A 500 error is returned.

Expected behavior

I expect the "Create Next App" homepage to be served

@opennextjs/cloudflare version

1.3.0

Wrangler version

4.37.0

next info output

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.6.0: Mon Aug 11 21:16:21 PDT 2025; root:xnu-11417.140.69.701.11~1/RELEASE_ARM64_T6000
  Available memory (MB): 32768
  Available CPU cores: 10
Binaries:
  Node: 20.11.0
  npm: 10.2.4
  Yarn: 4.9.4
  pnpm: 10.16.1
Relevant Packages:
  next: 14.2.32 // An outdated version detected (latest is 15.5.4), upgrade is highly recommended!
  eslint-config-next: 15.4.6
  react: 18.3.1
  react-dom: 18.3.1
  typescript: 5.9.2
Next.js Config:
  output: N/A
 ⚠ An outdated version detected (latest is 15.5.4), upgrade is highly recommended!
   Please try the latest canary version (`npm install next@canary`) to confirm the issue still exists before creating a new issue.
   Read more - https://nextjs.org/docs/messages/opening-an-issue

Additional context

Issue is related to #719